Floor cleaning machine



FIG. 1 is a front, top and right side perspective view of a floor cleaning machine showing my new design;

FIG. 2 is a front, top and left side perspective view showing the design;

FIG. 3 is a front elevational view of the design;

FIG. 4 is a right side elevational view of the design;

FIG. 5 is a rear elevational view of the design;

FIG. 6 is a left side elevational view of the design; and,

FIG. 7 is a top plan view of the design.

The broken line showing of various elements in the drawings is for the purpose of illustrating portions of hardware and mechanical structure and forms no part of the claimed design. 

The ornamental design for a floor cleaning machine, as shown and described. 